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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>grid-template-columns neutral keyframe</title>
<link rel="help" href="https://drafts.csswg.org/css-grid/#track-sizing">
<meta name="assert" content="grid-template-columns supports neutral keyframe.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>
</head>
<body>
<div id="target"></div>
<script>
test(() => {
target.style.gridTemplateColumns = '200px';
var animation = target.animate([{}, {gridTemplateColumns: '30px 300px'}], 1000);
animation.pause();
animation.currentTime = 500;
assert_equals(getComputedStyle(target).gridTemplateColumns, '30px 300px');
target.style.gridTemplateColumns = '20px 200px';
assert_equals(getComputedStyle(target).gridTemplateColumns, '25px 250px');
target.style.gridTemplateColumns = '200px';
assert_equals(getComputedStyle(target).gridTemplateColumns, '30px 300px');
}, 'Invalidate the result for the neutral keyframe if the size of the list changes.');
</script>
</body>
</html>
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